/Engine/Source/Editor/UnrealEd/Public/AssetSelection.h
Builds a list of strings for populating the actor factory context menu items. This menu is shown when the user right-clicks in a level viewport.
static void GenerateActorFactoryMenuItems ( const [FAssetData](API\Runtime\CoreUObject\AssetRegistry\FAssetData) & AssetData, [TArray](API\Runtime\Core\Containers\TArray)< [FMenuItem](API\Editor\UnrealEd\FActorFactoryAssetProxy\FMenuItem) > * OutMenuItems, bool ExcludeStandAloneFactories )